Automatic screw-machine.



H. B.` LESTER. AUTOMATIC SCREW MACHINE. APPLIoATIoN rnn um 2a. 1901,

Patented Nov.9, 1909. 11 SHEETS-SHEET 1.

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` H. B. LESTER.l AUTOMATIC SCREW MACHINE. APPLICATION PILvED JAN. 28,1907.

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Patented Nov. 9, 1909.

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Patented Nov.9, 1909.

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H. B. LESTER. AUTOMATIC SCREW MACHINE.

APPLICATION FILED JAN. za, 1907.

Patnted N0v.9,1909.

11 SHEETS-SHEET 5.

' H. B. LESTER.V AUTOMATIC SCREW MACHINE.

APPLICATION FILED JAN. 28, 1907.

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APPLIUATION FILED JAN. 28, 1907. 939,604. r v Patented Nov. 9, 1909.

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AUTOMATIC SCREW MACHINE. C APPLICATION FILED JAN. 28. 1907.

Patented Nov. 9,1909.

11 SHEETS-SHEET 8.

` H. B. LESTER. AUTQMATI SBEW MACHINE.

PPLIOATION FILED JAN. 28, 1907.

Patented Nov.9, 1909.

11 SHEETS-SHEET 9.

Patented Nov. 9, 1909. SHEETS-SHEET 10.

Aanv H B LESTER AUTOMATIC SCREW MAOHINE.

APPLIoATIoN FILED JAN. 2a, leo?.

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H. '13. LESTER. AUTOMATIC SOREW MACHINE.

v APPLICATION FILED JAN. 28, 1907. Patented Nov. 9

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' UNITED sTATEs EATENT OFFICE. l

HARRY B.- LESTER, Vor HARTFORD, coNNEcTIcUT, AssIeNoRro-THEKKDAVIS"SEWING To all whom 'it may` concern.'

. olution MACHINE COMPANY, 0E DAYtro1\ I` OHIO, A CORPORATION OF- OHIO.

[AUTOMATIC SCREW-MACHINE. L Y

Be it'known that 1, HARRYB. LESTER, a citizen of theUnited States, n'residing at Hartford, in the -county A'of Hartford land State ofConnecticut, have invented a Inew* and useful Automatic Screw-Machine,of which the followinglis a specification.'

This' invention relates yto, an automatic screw machine of` the'multiple tubular-spindle rod-feed'tyjwe.l f' 'i The object ofy theinvention is to producea simple, compact machine of l -wide scope andhigh eiie'iency having tubular spindles that are lalwajis 4rotated inthe same direction 'for causing lthe stockto' be operated 4uponv lbytheatools, which spindles can be retained at tl-ieirlrespective stationsand. caused to feed the'stock-collectively to the 'saine or differenttools forproducing -the same lor di'lferent cuts on the several rods,or'the spindles can @be `given intermittent revolutionary movementswhereby the stock may besuccessively presented to a less-number, thesame number or a larger number of tools thanvthere are spindles, forproducing pro` gre'ssive cuts ofthe desired character upon` t-he severalrods. f

The machine which is illustrated is so designed that three rods of stockmay be fedv collectively, each to its 'own tool and no other, whichtools` may be the same or of a diti'erent character, a-nd'which at eachrevp'rcduce thefsame cut on each-rod, or the machine can be operatedso.- that three rods of stock held by the three spindles may besuccessively presentedto ythree different tools or to six' differenttools for producing, vthree or'y six different or Lsuccessive cuts uponeach rod, ywhereby a large number=of simple pieces or al smaller num'-ber of complicated pieces,-v that'is,l pieces. having a` variety: of`cuts,1 may be rapidly;

produced, on amachine which is 'comparatively cheap to build, which :canbe adjusted and `operated easily by an ordinary men-, chanac, wluchperforms' its r'operatlons accul rately, andv which' willoperatewitlilelittle power andnot readily get rout of adjustment- Figure1 ofthe accompanying-drawings shows a central vertical section.of'the'spindle head end of the machine. Fig. 2 sliows a centralvertical section of the driving mechanism at `the spindle head end ofthe machine. Fig.'3 shows an elevation of the left i ,SpecificationofzL-etters Patent.` Application filed' January 28, 1907. Serial N.354,497.;

\ ll'lhandrend ofthe machine.

"on Fig. 1.

" dexing mechanism.

4rotatory movements duringl each revolution.

Fig." 7 shows a face view of the; adjustable cam by means .of which thisvariation in feed is accomplished. F ig. 8 shows side and edge iviews ofthe lever which coperates with the adjustable 'cam. Fig. 9 shows the'ratchet andpawl which isactuatedby the cam and .lever for connectingthe driving vsprocket with the crank shaft that eects the rotation ofthe spindle head. Fig. 1 0 shows a face view-of a portion of the spindlehead i11- 11 shows a side elevation of the indexbolt andthe connectionby means of which itis operated by the cam. Fig. 12 shows a centrallongitudinal section of vthe tool head and adjacent mechanism. Fig. 13shows a longltudinal section of the tool head and the mechanism foractuating one of the' threading tool spindles. Fig. 14 shows anelevation 'looking toward the tool head from the left. -F ig. 15'showsany elevation of the right hand end of the machine. view of the meansemployed for causing the chucks .to operate simultaneously.l Fig. 1Tshows a diagram ,of the rapid friction drive for the threadingspindles.l Fig. 18 shows aidiagrain of the-positive slow drive for thethreadin'gfspindle. vF ig. 19(l shows "the manner of holding a radialtool holder.

'In the'machine `illustrated ythere are three stock 'spindles with rod'feeds andv chucks and there'are three' transversely ,movable cut-- "tingtools and means for using six axially .movablle 4t`ools,'lftwo ofthe'latter beingsho'wn asV threadingtools.

- l It is to be understood however that the invention is ynot limitedv`to the exact'number of spindles shown, and'als'o "that the numberoftools would be increased or j diminished correspondingly"fwith thenumber of spindles the'machine has.

' Thespindle head l is rotatably supported at its lends by bearings inthe frame 2. j Each spindle has a feed tube 3 Withfa'split gripplngcollet 4 at one end 'and a grooved collar 5 at the other end. The feedtubes are drawn `back and fed forward at the proper Fig. 16 shows a sideandv an fend time by thel engagement with the grooved collars of eitherthe three rolls 6 or the single roll 7 according to the adjustment ofthedisk 8 on which the rolls are mounted and which is fastened to a shaft 9that extends through the center of the spindle head and also through thecenter of the box tool head "10; (Figs. 1, 3, 12.) If the disk is soturned that the three rolls engage with the collars on the ends of thethree feed tubes all of the feediltubes are reciprocated simultaneouslybut if the disk is so turned that only one roll engages with a collar(as shown in Fig. 8) but one Ifeed tube will be reciprocated 'with eachreciprocation of the tool head.

The feed tube. reciprocating shaft is connected with the tool head bymeans of the arm 11 and the nuts 12 which are threaded on the end of theshaft. This arm has a' hub 13 that extends into the end of the toolvhead and in this hub is a spline 14 that en` ters theshaft so that theshaft will be turned when the armlis turned. The arm is held inposition. by a screw 15 which passes to turn the shaft and disk forcausing either the single roll to successively engage with the collarson the ends of the feed tubes or causing the three rolls to lengage withthe three collars on the ends of the feed tubes, or the arm, shaft anddisk may be so turned that all the rolls are disengaged allowing thefeed tubes to be drawn out of the spindles. Vhen the screw is tightenedthe arm and the connected parts are held from turning. As the tool headis moved back and forth arm moves the shaft and reciprocates the feedtubes a distancedepending upon the adjustment of the nuts on the shaft(Figs. 12, 15).

The hub of the tool holder has a rack meshing with which is a gear 17that meshes with a rack on the end of a bar 18 lwhich extends backwardlyto thehead end of the machine where it is supported by a part of theYframe (Figs. 1, 12). This bar has a roll 19 which is engaged by the cams20 and 21 adjustably fastened on the surface of a cam cylinder 22, whichis keyed to a sleeve 23. This sleeve is supported by the frame and isprovided with a worm wheel 24 that is engaged by a worm 25. (Figs. 1,2). On the worm shaft is a bevel gear 26 that meshes with a bevel gear27 on a shaft 28 that. extends longitudinally along the front ofy themachine and has a gear 29 that engages with a gear 30 which meshes witha gear 31 on a shaft bearing sprocket wheel 32 that is connected by achain 33 with a sprocket wheel 34that is attached to the hub 35 of thedriving I`-`pulley 36. (Figs. 2,

. Inside of each spindle, but outside of the feed tube, is a chuck tube37 at the forward end of which is a spring jaw chuck 38. The position ofthe chuck with relation to the chuck closing sleeve 39 is determined bythe adjustment of the nut 40 threaded upon the rear end of the spindle(Fig. 1). The chuck closing sleeve is normally thrust forward by thespring 4l and is drawn backward for closing the chuck jaws by levers 42that are pivotcd on the collar 43 mounted on the spindle and that arespread by the conical wedge 44. (Fig. l). The wedge is moved backwardlyand forwardly at the proper time by the engagement of a lug 45projecting from the cellar 46 on the wedge sleeve, with a lever 47 thatis pivotcd to the frame .and that is oscillated by cams 48 adjustablyfastened to the cylinder 49 which is keyed upon the sleeve 23 that isrotated by the worm wheel 24. (Figs. 1, 2,

If the roll disk 8 is turned to the position shown in Fig. 3 so that thefeed tubes are moved one at a time when the spindles reach the properstation during their revolutions withthe head, the chucks are opened andclosed one at a time, but if the roll disk is turned so that the threefeed tubes are reciprocated simultaneously the chucks will be opened andclosed simultaneously. The inner edge 50 of each chuck wedge collar 46extends into a groove in a sleeve 51 that is movable on the shaft 9. Thegroove has portions of its walls cut away so that when the sleeve is inone position the collar which is moved by the lever for causing thechucking cone to act will move without engaging the sleeve. The outerend of this sleeve is arranged so that it may be grasped and is providedwith a removable key 52 to prevent accidental movement. )When the key isremoved the sleeve may be turned to such a position that the walls ofthe groove will engage the inner edges of all of the chuck wedge collarsso that when one collar is moved by the lever all of the collars` willbe moved. (Figs. 1, 5, 16).

Keyed upon each spindle is a pinion 53 and encircling the spindles andhaving interior teeth meshingwith the pinion teeth is a gear 54 whichalso has exterior teeth. .ln

the head between the spindles grooved pulleys 55 are arranged uponarbors 56 for supporting the gear. Meshing with the exterior teeth ofthe gear that surrounds the spindles is a pinion '57 that is keyed to a.shaft 58 which is driven by the driving pulley 59 (Figs. 1, 2). Therotation of this driving pulley causes the encircling gear to rotate thespindles at all times uniformly and in the same direction regardless oftheir position about the axis of the head.

Fastened about the spindle head is a ring 60 which on one side of itsperiphery has ratchet teeth 61 and on the other side has index notches62. Held by a spring 63 so as to engage with the ratchet teeth is a pawlsaam wheel 71 that is attached to the hub of the` driving pulley '36(Figs. 2, 3).

On the crank shaft and keyed thereto is a block 72 which'carridssliding' Pawl 73 that is normally thrust by a spring 74 to- 'ward theteeth of a ratchet wheel 7 5- secured in the hub ofthe sprocket 69.(Fig. 6). When the sliding 'pawl en ages the ratchet teeth the loosesprocket'an .crank shaftare so connected that the revolution of thedriving pulley causes the index pawl to give the spindle head anintermittent rotatory movement. The sliding pawl that connects the crankshaft with the ratchet wheel in the sprocket is withdrawn and held backat the pro er time so that the head will remain stationary, by the lever7 6 which is ivoted to the frame and is ushed forward y so as to-enga ethe pawl y the cam disks 77 onv the sha 108 which has a gear 109 thatengages with the vgear 110 on the sleeve 23 that is rotated by the wormwheel 24. (Figs. 395i6a78a9) I Each of the cam disks has a portion ofits periphery cut away and they are held together by bolts 78 which whenloosened permits the disks toy be adjusted so as to vary the lentl ofthe-periphera1 opening. (Fig. 7). en 'the opening in the periphery inthe disks is back of the lever, the lever 1s drawn back by a spring 79so as to release the pawl and allow it to engage the ratchet and connectthe sprocket and crank shaft. The time that the pawl is allowed to stayin contact with; the ratchet teeth depends on the length of the o ningin the peri hery of the cam. When t e cam turns so t at the' lever ispushedV forward the awl1 as the block 72 rotates with the cran shaft,engages the cam 80 on the lever and is forced back from the ratchet soas to disconnect the sprocket and the crank shaft. If the opening 1n theperiphery of the camresulting from the adjustment of the disks is shortthe lever is drawn back only a sulficient length of time' for the crankto make -the openin one revolution andl to advance the spindle head onestep', which is in the .form .of machine shown, one-sixth of arevolution. If in the eriphery of the lcam is long the' ever stan sretracted a suilicient length of time for the crank to make tworevolutions, in which case the pawl makes two reciprocations andadvances the spindle head two steps, or in th case illustrated one-thirdof a revolution, so that by ad'usting the disks which make up this cam wich is used to effect the connection`of the driving sprocket and crankshaft, the head may vcarries a cutting tool 91.

at will be given an intermittent rotation of either one-third vorone-sixth of a revolution. Engaging the index notches in the peripheryof the index ring on the spindle head is the end of an indexing bolt 81.This bolt is normally pressed down by a spring 82 and is lifted at theproper time and held .lifted -a suflicient length of time to permit theheadto be advanced, by the arm 83 which is adjustably secured to thebolt by means. of the nuts 84 (Fig. 1 The arm is connected by the link-85vw1th a lever 86 that is pivoted to the frame of the machine and hasa roll that is adalpted to be enga ed by the cam blocks 87 t at areremovaly secured to the face Aof the gear 88 which is mounted upon thehead and is driven by the gear 110 keyed to the sleeve 23 that is driveny the worm wheel 24 (Figs. 1, 10, 11). n

On the face of the rame are tool boxes 89. The hubs of these boxes' areadjustably fastened in (place so that the distance of the tools carrieby the boxes from the face of the head may be varied (Figs. 1, 4, 19).

r In each tool box is a tool holder 90 that is arranged to be movedradially toward -and from an` adjacent spindle. Each' tool holderProjecting inwardly from each tool holder is a stud 92 and extendingthrough the hubof each box is a shaft 93gprovided on its forward endwith a cam 94 that is arranged to'engage the studv for the urpose offeeding the tool holder and toolptoward the spindle. A spring isarranged `to-draw the tool holder outwardly and hold the stud inengagement with the surface ofthe cam (Figs. 1, 4).

' Splined on the shaft of each tool cam is a pinion 95. These pinionsengage with ear teeth cut in the periphery 'of the hub o the ear 88 thatsurrounds the head. (Fig. l).

y means of this mechanism :the radially moving tools are caused to moveforward and fromthe .stock carried by the spindles mounted in the'head-As previously stated the hoxtools. or 4those tools which are fixed inthelongitudinally moving tool head 10 arereciprocated toward and from thework at the roper time by a ear and the rack bar w 'ch.is reciprocat bthe cams on the cam cylinder that is driven by the worm which alsodrives thev inion that engages the gear which has t e teeth in its hubthat cause the radially moving tools to be actuated.

Extendingthrough the tool headbut not movable therewith are a pairofthreading spindles 96. These are loosely held by the frame that supportsthe tool head. `These spindles may carry t`a s or dies or one mav carrya tap and the ot er a die, according: o the work which it is .desiredYto accomplish. (Figs.13,14. I

On-each t readino spindle and fastened thereto is4 a; bevel frict-iohpulley 97 and loose on each spindle is a pinion 98.H The pinionhas arotation on the spindle but no longitudinal movement, bein held by theframe, while the friction pul ey rotates the spindle. and also moveslongitudinally with a. (Fig. la)

On the outer end of each tool spindle and movably fastened thereto is aframe 99 with a groove 100. In these grooves are rolls 101 on the upperends of arms 102 that extend from a shaft 103 mounted in the frame andhaving an arm 104 with a roll- 105 on its lower end that is adapted tobe engaged by t-liecams 106 on the cam disks 107 that are fastened tothe. shaft 108 which extends longitudinally of the machine. The rotationof this shaft with these cams oscillates the arms in such manner as topush the spindles forwardly and backwardly at the proper time. (Figs.13, 15.)y The shaft 108 has a gear 109,(Figs. 5, 15) which meshes withthe gear 110 keyed to the sleeve, 23 which is driven by the worin wheel24.

y. Beneath the bevel friction pulleys on the threading tool spindles, isa cooperating friction pulley 111 formed on the hub of a belt pulley 112which is by the belt 113 driven from the pulley 1141 keyed to the shaft58 which is `driven by the pulley 59 (Figs. 12, 13, 17).

Meshing with the pinions 98 on the thread .ing tool spindles is a gear115 `that is engaged by the ear 116 which meshes with the gear 117 ont eshaft 58 (Figs. 12, 13, 18).

On the face of the gear that turns loosely on the spindle and onthe faceof the adj acent friction pulley are clutch pins 118. When the spindleis forward the clutch pins are vdisengaged and the friction pulley onthe spindle isin contact with and is rotated by the friction drivingmeans at high speed, in fact faster than the rotation l.of the stockspindles sor/that" the threading tool will be unscrewed from the threadwhich it has cut on the stock. When the spindle is back and the frictionpulleys are disengaged, the clutch pins will be engaged so that thespindle will be driven in the same direction positively by thev gears,but very much slower, in fact slower than the stock spindlesv so thatthe threading tool will cut a thread on the rotating stock 13).

The outer end of the stem 119 of each threading tool lholder 120 isthreaded and bears nuts 121, 122. A spring 123 arranged to thrustagainst a collar on the stein, and a collar in the threading spindle,tends to hold back the stem with re ation to the threading spindle andwithdraw the spindle when the tool is free fromithe hole threaded. (Fig.13.)

rlhe frames 99 have a slight longitudinal movement on the spindles, theamount of this movement being determined by the adjustment ofthethreaded bushings 124 which holds the frames on the spindles. Thecams are so ,timed that the levers thro h the frames first start thethreading too onto the stock with a positive push after which thetoolsfollow the threads which they cut. When the threads have beencut,the nuts 121 on the stems of the tool holders engage the frame and thefurther advancement of the tools, as the thread is cut, causes thespindles to be moved forwardly so that the clutch pins are disengaged,releasing the gear driving mechanism. The friction pulleys are thencarried into engagement with the friction drive which rotates thespindles so much faster than the stock that the tools unscrew from thethreads which they have cut. When the tools are unscrewed the requisitedistance the nuts 122 engage the frames and draw the spindles backwardso that the friction pulleys are disengaged from the friction drive andthe clutch pins engaged so the spindle will again be driven by thegears.

As above mentioned when the friction pulleys are engaged the threadingtool spindles are rotated much faster than the stock spindles so thatthe tools will be unscrewed from the stock, but when the gears areconnected the threading tool spindles are rotated slower than the stockspindles so that a thread will be cut on the stock. The levers whichengage the frames attached to the spindles are so actuatedby the camsthat they start the threading tools onto the stock positively andwithdraw the threading tools from the stock after they have beenunscrewed, and they also hold the friction pulleys in engagement at theproper time.

In .the machine illustrated three rods of stock can be intermittentlyfed to the tools. Vlfhen the feeding and chucking-mechanisnis areadjusted in one manner the three rods of stock will be uiiclamped, fedforward and clamped simultaneously so that each rod Will be acted uponby its own tool, which tools may be similar or dissimilar in character.lf the clutching and feed mechanisms are adjusted in another manner, thethree rods of stock are released, fed and clamped successively so thateach rod ivill be presented progressively to all of the tools which arerequired to produce the desired cuts. -If the head rotating mechanismand indexing mechanism is in one adjustment the ratchet moves thespindle head one-sixth of a revolution each time the index disk isunlocked so that stock held by these spindles may be presented to sixend tools. lf the head rotating mechanism is in its other :id-

justinent the ratchet makes tivo movements l the three differentspindles to three oud tools.

' the-head rotatingmechanism, a larger num-.fk

. eamo-i With the construction illustrated and described theseadjustments can be made by any ordinary mechanic without danger ofmjuringthe machine.

1. A screw machine having a rotatable head, mechanism for impartinrotatory movement to the head, gearing riven-continuously from thedrivin means controlling the action ofthe connectin and disconnectinglmechanism, gearing driven continuously from the driving shaft, and a camcontinuously rotatedjby said laitter gearing and actuating thecontrolling means foi` different periods whereby the number of stops ofthe head during each revolution may be varied, substantially asspecified.

2. A screw machine having a spindle head, mechanism for impartingrotatory movement to the head, gearing'driven continuously from thedriving' shaft, mechanism for connecting and disconnecting the headrotating mechanism and sa id gearing, means controlling the action ofthe connectin and disconnecting mechanism, gearing riven continuouslyfrom the driving shaft, a cam rotated continuously by said latter earinand actuatin the controlling means 01' di ferent perio s whereby thedistance of the rotatory movement of the head may be increased ordiminished, spindles carried by the head and mechanism for rotating thespindles, substantially as specified.

3. A screw machine having a spindle head mechanism for impartingvintermittent rotatory movement to. the head, stockI spindles carried bythe head, mechanism for' rotating the spindles continuously in the samedirec-v tion, means for feeding a rod longitudinally through eachspindle when the head is idle,

means for clamping a rod in each spindle,`

mechanism for operating the feeding means and the clampingmeans 1nconjunction with ber of end tool holders than there are stock spindles,and means for adjusting the head rotating mechanism whereby the head maybe stopied so as to present each spindle with its fee holder or onlypart of the tool holders, substantially as specified.

4. A screw machine having a spindle-head, mechanism for impartingrotatory movement to the head, gearing driven continu.- ously from thedriving shaft, mechanism for connecting and disconnecting the headrotating mechanism and said gearing, means controlling the action of theconnectin and disconnecting. mechanism, gearingt iven continuously fromthe drivin sha a cam rotated continuously by said atter gearing, saidcam being adjustable so that it may act mechanism with either one or allof t and clamp in line with every tool for a longer or shorter riod onthe control-.f ling means, and tool ho ders movable axially of thespindles, substantially as specified.

5. A screw machine having a rotatable spindle head, spindles carried blthe head, mechanismffor rotating the spin es, adjustable mechanism for.rotating the head a tei' or less amount, and .a greater numshaft,`mechanism for connecting and (isconnecting -thehead rotating mechanismwith said gearing,

r of axially moving tool holders than there are "spindles, substantiallyas specified.

' 6. A screw, machine having a spindle head, mechanism for impartingrotatory movement to the head, earing driven continuously from thedriving shaft, mechanism for connecting and disconnecting the headrotating mechanism and said gearing, means controlling the action of theconnectin and disconnecting mechanism, gearingt riven continuously fromthe driving sha means for actuatin the contro means for different periospindles carried by the head,

mechanism for rotating the spindles continuonsly in one direction, meansfor feeding a rod longitudinally through each spindle when the head isidle, means vfor clamping a rod in each spindle, mechanism for operatingthe feeding and clamping means m conjunction with the head rotatingmeans,

andl means connecting the feed oplertieng e e ing means, and theclamping mechanism with either one or all of the clamping means,substantially as specified.

7. A screw machine having a rotatable head, spindles carried by thehead, means for feeding a rod through each spindle, means for clamping arod in each spindle, means for imparting an intermittent rotatorymovement to the head, adjustable'means for indexin and locking the head,tools movable radial y of the s indles and means surrounding the head anarranged to operate the index lock and also the radially movable tools,substantially as s cified.

8. A screw ma ine having a spindle head,-

mechanism for imparti a rotatory movement k.to the-head, spin escarriedby the head, mechanism for rotating the sjlindles, means for feeding arod through eac spindle, means for clamping a rod in each s 1ndle,mechanism for operating the fee ing means, mechanism for operatin theclamp ing means, a tool holder movab e axially of the spindles towardandfrom the spindle head, and mechanism adjustably connected to and'movable with said'tool holder and movably constructed and arranged so asto befcapable of connecting either one or .all of the feeding means withthe feed operating mechanism, substantially as specific 9. A screwmachine having a spindle head, a ratchet continuously rotated by thevdriving mechanism, a pawl for unparting a rotatory movement tothehead,a crank for reciprocating the pawl, means for 'connecting .lll

lll

thejc'ontiI-iuously rotated. ratchet with said crank, andan adjustablecam controlling the period of action of the connect means b etween thecrank mechanism and e continuoulsly rotated ratchet, substantially asspecifie 10. In a screw machin spindle head rotating mechanism having aratchet and pawl for imparting a rotatory movement to the head, a `crankfor reciprocating the pawl, a continuously drivenv clutch member mountedadjacent to anddapted to rotate the crank, a clutch memberf` arranged toconnect and disconnect the former clutch member and the crank, a Vleverfor actuating the latter clutch "member, and a continuously rotatedadjustable cam adapted according to its adjustment to cause the lever toco-act with thelatter clutch member for different periods of time andcause the ratchet and .pawl Lo rotatethe head for variable intervals,substantially as specified.

1l. A screw machine having a rotatable spindle head, rotatory spindlescarried by the head, means for feeding` rods through spindles, means forclamping rods in the spindles, a pinion mounted' on each spindle,rollers mounted in the head intermediate of the spindles, an internaland' external gear surrounding the head and mounted on the rollers andhaving its interior teeth in enga ement with the teeth of the pinions ont e spindles, and a pinion meshing with the external teeth lofl theannular gear, substantially as specified. c

12. A screw machine having a rotatable spindle head, a tool s indlemovable parallel with the axis ofthe ead, a cam and a lever engaging andadapted to move said spindle longitudinally,- means for rotating thetool spindle, athreading tool holder supported by andmovable with, buthaving a limited movement independently of the tool s indle, said toolholder having an extende stem, and means adjustably .connected with thestem of the threading tool holder and adapt- .by the spindle, and meansadjustable on the stem of the threading tool holder for moving thespindle and causing the e agement 'of the friction gearing and theIdtisen g@- ment of the posltive gearing or the `sen gagement of thefriction gearing' and the enga ement of the positive gearing, substantia1y as specied.

14. A screw machine having a rotatable head, mechanism for impartmrotatory movement to the head,- gear ven continuously from the drivingslllxait, mechanism for connecting and disconecting the head rotatingmechanism with said gearing, and an adjustable cam rotated continuouslyfrom the driving shaft and actuating said controlling means fordifferent periods whereby the distance of rotatory movement of the headmay be increased or diminished, substantially as specified.

15. A screw machine having a rotatable spindle head, rotatory spindlescarried by the head, mechanism for imparting a rotabory movement to thehead, mechanism for rotating Vthe spindles, a larger number of toolsthan spindles movable axially'toward and from the spindles, and meansfor present' and stopping the spindles before all of the toolsor onlypart of the tools, substantially as specified. A

HARRY B, LESTER.- Witnesses:

G. H. Gollum,

W. W. CUNNINGHAM.

